/*
Copyright 2024 The Karmada Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package statefulset

import (
	"log"

	apps "k8s.io/api/apps/v1"
	v1 "k8s.io/api/core/v1"
	"k8s.io/client-go/kubernetes"

	"github.com/karmada-io/dashboard/pkg/common/errors"
	"github.com/karmada-io/dashboard/pkg/common/types"
	"github.com/karmada-io/dashboard/pkg/dataselect"
	"github.com/karmada-io/dashboard/pkg/resource/common"
	"github.com/karmada-io/dashboard/pkg/resource/event"
)

// StatefulSetList contains a list of Stateful Sets in the cluster.
type StatefulSetList struct {
	ListMeta types.ListMeta `json:"listMeta"`

	Status       common.ResourceStatus `json:"status"`
	StatefulSets []StatefulSet         `json:"statefulSets"`

	// List of non-critical errors, that occurred during resource retrieval.
	Errors []error `json:"errors"`
}

// StatefulSet is a presentation layer view of Kubernetes Stateful Set resource.
type StatefulSet struct {
	ObjectMeta          types.ObjectMeta `json:"objectMeta"`
	TypeMeta            types.TypeMeta   `json:"typeMeta"`
	Pods                common.PodInfo   `json:"podInfo"`
	ContainerImages     []string         `json:"containerImages"`
	InitContainerImages []string         `json:"initContainerImages"`
}

// GetStatefulSetList returns a list of all Stateful Sets in the cluster.
func GetStatefulSetList(client kubernetes.Interface, nsQuery *common.NamespaceQuery,
	dsQuery *dataselect.DataSelectQuery) (*StatefulSetList, error) {
	log.Print("Getting list of all stateful sets in the cluster")

	channels := &common.ResourceChannels{
		StatefulSetList: common.GetStatefulSetListChannel(client, nsQuery, 1),
		PodList:         common.GetPodListChannel(client, nsQuery, 1),
		EventList:       common.GetEventListChannel(client, nsQuery, 1),
	}

	return GetStatefulSetListFromChannels(channels, dsQuery)
}

// GetStatefulSetListFromChannels returns a list of all Stateful Sets in the cluster reading
// required resource list once from the channels.
func GetStatefulSetListFromChannels(channels *common.ResourceChannels, dsQuery *dataselect.DataSelectQuery) (*StatefulSetList, error) {
	statefulSets := <-channels.StatefulSetList.List
	err := <-channels.StatefulSetList.Error
	nonCriticalErrors, criticalError := errors.ExtractErrors(err)
	if criticalError != nil {
		return nil, criticalError
	}

	pods := <-channels.PodList.List
	err = <-channels.PodList.Error
	nonCriticalErrors, criticalError = errors.AppendError(err, nonCriticalErrors)
	if criticalError != nil {
		return nil, criticalError
	}

	events := <-channels.EventList.List
	err = <-channels.EventList.Error
	nonCriticalErrors, criticalError = errors.AppendError(err, nonCriticalErrors)
	if criticalError != nil {
		return nil, criticalError
	}

	ssList := toStatefulSetList(statefulSets.Items, pods.Items, events.Items, nonCriticalErrors, dsQuery)
	ssList.Status = getStatus(statefulSets, pods.Items, events.Items)
	return ssList, nil
}

func toStatefulSetList(statefulSets []apps.StatefulSet, pods []v1.Pod, events []v1.Event, nonCriticalErrors []error,
	dsQuery *dataselect.DataSelectQuery) *StatefulSetList {
	statefulSetList := &StatefulSetList{
		StatefulSets: make([]StatefulSet, 0),
		ListMeta:     types.ListMeta{TotalItems: len(statefulSets)},
		Errors:       nonCriticalErrors,
	}

	ssCells, filteredTotal := dataselect.GenericDataSelectWithFilter(toCells(statefulSets), dsQuery)
	statefulSets = fromCells(ssCells)
	statefulSetList.ListMeta = types.ListMeta{TotalItems: filteredTotal}

	for _, statefulSet := range statefulSets {
		matchingPods := common.FilterPodsByControllerRef(&statefulSet, pods)
		podInfo := common.GetPodInfo(statefulSet.Status.Replicas, statefulSet.Spec.Replicas, matchingPods)
		podInfo.Warnings = event.GetPodsEventWarnings(events, matchingPods)
		statefulSetList.StatefulSets = append(statefulSetList.StatefulSets, toStatefulSet(&statefulSet, &podInfo))
	}

	return statefulSetList
}

func toStatefulSet(statefulSet *apps.StatefulSet, podInfo *common.PodInfo) StatefulSet {
	return StatefulSet{
		ObjectMeta:          types.NewObjectMeta(statefulSet.ObjectMeta),
		TypeMeta:            types.NewTypeMeta(types.ResourceKindStatefulSet),
		ContainerImages:     common.GetContainerImages(&statefulSet.Spec.Template.Spec),
		InitContainerImages: common.GetInitContainerImages(&statefulSet.Spec.Template.Spec),
		Pods:                *podInfo,
	}
}
